gdb: Add default reggroups for ARC
There is no reggroups set in ARC. If a "maintenance print reggroups"
command is issued, the default register set is dumped (which is fine).
However, if a new group is added via an XML file, then that will
become the _only_ group. This behavior causes gdb.xml/tdesc-regs.exp
to fail.
Fixes gdb.xml/tdesc-regs.exp on ARC.
gdb/ChangeLog:
* arc-tdep.c (arc_add_reggroups): New function.
(arc_gdbarch_init): Call arc_add_reggroups.
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